I happen to own both of these harps.*
I like the Blevins harp quite a bit, but I *love* the Merlin. To compare, the Blevins spacing is a little wider than the Merlin, the tension is a little higher, and the tone is quite a bit brighter. The harp is well-made and very solid.
If I had to choose between the two, it would be an easy choice for me – I’d take the Merlin. But if I didn’t have a choice, and had only the Blevins, I would not be unhappy. It’s a good harp.
* no, I do not have a whole stable of harps.
I’m in a long distance relationship, and one of the harps is at my sweetie’s place – it’s just a coincidence that I happen to own these two particular models.